package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        String pwd = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!pwd.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 添加员工
     *
     * @param employeeDTO
     * @return
     */
    @Transactional
    @Override
    public Result addEmp(EmployeeDTO employeeDTO) {
        //1.参数校验，非空判断，提升代码的健壮性
        if (employeeDTO.getUsername() == null){
            return Result.error(MessageConstant.USER_NOT_FOUND);
        }
        //2.根据账号去查询数据是否存在，如果存在，则返回错误信息
        Employee employee = employeeMapper.getByUsername(employeeDTO.getUsername());
        if (employee != null){
            return Result.error(MessageConstant.ACCOUNT_EXEIT_FOUND);
        }
        //3.新增操作,调用mapper接口
        employee = new Employee();
        /**
         * beanutils工具类，进行bean对象属性的拷贝使用
         * 要求，两个对象中的属性名称和属性类型必须完全一致的情况才可以拷贝成功，否则失败
         */
        BeanUtils.copyProperties(employeeDTO,employee);
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        employee.setStatus(StatusConstant.ENABLE);
        employeeMapper.addEmp(employee);
        return Result.success();
    }

    /**
     * 分页查询
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public Result page(EmployeePageQueryDTO employeePageQueryDTO) {
        if (employeePageQueryDTO.getPage() == null){
            employeePageQueryDTO.setPage(1);
        }
        if (employeePageQueryDTO.getPageSize()==null){
            employeePageQueryDTO.setPageSize(5);
        }
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());
        Page<Employee> employeePage = employeeMapper.pageQuery(employeePageQueryDTO);
        PageResult pageResult = new PageResult();
        pageResult.setTotal(employeePage.getTotal());
        pageResult.setRecords(employeePage.getResult());
        return Result.success(pageResult);
    }

    /**
     * 启用和禁用
     * @param status
     * @param id
     * @return
     */
    @Override
    @Transactional
    public Result updateEmpStaus(Integer status,Long id) {
        if (id==null){
            return Result.error(MessageConstant.ID_NOT_FOUND);
        }
        if (status==null){
            return Result.error(MessageConstant.UNKNOWN_ERROR);
        }
        Employee employee = new Employee();
        employee.setStatus(status);
        employee.setId(id);
        employeeMapper.updateEmp(employee);
        return Result.success();
    }

    /**
     * 按照id查询员工
     *
     * @param id
     * @return
     */
    @Override
    public Result getById(Long id) {
        if (id == null){
            return Result.error(MessageConstant.ID_NOT_FOUND);
        }
        Employee employee = employeeMapper.getById(id);
        employee.setPassword("********");
        return Result.success(employee);
    }

    /**
     * 修改员工
     *
     * @param employeeDTO
     * @return
     */
    @Transactional
    @Override
    public Result updateEmp(EmployeeDTO employeeDTO) {
        if (employeeDTO.getId()==null){
            return Result.error(MessageConstant.ID_NOT_FOUND);
        }
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
        employeeMapper.updateEmp(employee);
        return Result.success();
    }

}
